Concrete trough form



' G. E. HEILIGMAN CONCRETE TROUGH FORM Filed -y 10. 1925 2 Sheets-Sheet l gnwntox Heilgimdfi- G. E. HEiLlGMAN CONCRETE THOUGH FORM Filed July 10. 1925 2 Sheets-Sheet 2 'Illl'i! lllllll||lii mmxwxwxwmxxxm gwventoz GTE. HsiZic-i I iv- Patented July 13, 1926.

STATES eEone E. HEILIIGMAN, or Ho vno, TEXAS; j

concnn rn THOUGH roam.

. Application filed July 10, 1925. Serial No. 42,847.

This invention relates to an improved form for roundconcrete troughs and seeks, among other objects, to provide a form of this character which may "be readily set up and as. easily removed atterthe trough has set. Y

The; invention seeks, as. a further object, to p o id a term embody ng inner an outerconcentric. shells, and wherein the .circumference of the shells maybe varied for forming different sized troughs.

Andt he invention seeks, as a still further object, to provide a novel brace for the inner shell and wherein, meanswil'l be provided for expanding the brace to rigidly support the inner shell against collapse.

Other and incidental objects will appear shown in Figure 4, is a collar 15 having a slot 16, and formed in the opposite end of the brace is a series of spaced notches/17.

hereinafter.

Inthe accompanying drawings:

Figure 1 is a top plan View showing my improved form in connection with a concrete trough.

Figure 2 is a vertical sectional view on the line 22 of Figure 1, looking in the direction indicated by the arrows.

Figure 3 is a detail sectional view showing the joint between the sections of the braces for the inner shell.

Figure 4 is an enlarged sectional view showing the expanding lever of one of the braces. s

Figure 5 is a sectional view on the line 55 of Figure 4, looking in the direction indicated by the arrows.

In carrying the invention into eliect, I employ an inner shell 10 and a somewhat wider concentric outer shell 11, which are preferably constructed of resilient sheet metal and, as shown in Figure 2, respectively comprise a long section which is somewhat over sem1-cyl1ndr1cal and a pair of like shorter sections. The sections of each shell are swingingly and detachably connected by pairs of butt hinges 12 disposed near the upper and lower edges of the sections, andby removing the hinge pins of the hinges at the ends of one of the short sections, said section may be displaced and the hinge platesat the free end of the remaining short section connected to the hinge plates at the ad jacent end of the long section for thus contracting the shell. Accordingly, the shells may be employed to form difierent sized troughs.

Disposed within the inner shell is a pair of like annular braces 13 abutting the con- 'panded.

fronting longitudinal edges of the pairs or i hinges 12 of said shell and, limited against. displacement at the ends of the shell by. said liin'gesjEach of said bracesis of tubular construction and is formed preferably of a pluralityof mating sections detachably connected with each other, as shown in Figure 3, by curved pins 1 1 fixed in corresponding ends of the sections. Oneof the sections of each brace is of a length corresponding to the. length of the short sections of the inner shell respectively, sothat'when one of the short sections of said shell is removed for contracting the shell, the like short sections of the braces may also be removed, thereby adapting the braces to the smaller shell.

Screwed over one end of each brace, as

is freely received through the slot 16 of the collar 15 and is pivoted upon a rod 21 connecting the rod 18 with said collar. Pivoted upon the lever is a ,pawl22, the free end of which is selectively engageable in the notches 17. Thus, thelever may be swung for spreading the ends of the braceapart and expandingthe brace, and formed in the rod 18 is a series of openings 23 to selectively relocking the brace ex- In use, the shell 11 is placed upon a fiat surface when cement is poured into the shell to form the bottom wall 25.01? the trough. i

The shelllO is then positioned concentrically within the shell'll to rest at its lower edge upon said bottom wall, when the braces 13 are arranged within the shell 10 and expanded, as previously described, for rigidly bracing said shell and holding the shell in cylindrical shape. Additional cement is then poured into the annular cavity between the shells 10 and 11 to form the side wall 26 of the trough. The cement which forms the side wall is, of course, introduced while the cement of the bottom wall is still plastic so that said walls will integrally unite and, as

will be seen, the cement of the side wall will, by its weight, press outwardly against the shell 11 to extend said shell to cylindrical shape so that the side wall of the finished trough will accordingly be formed with concentric inner and outer faces. When the cement has set, the braces 18 are first removed when the shells 10 and 11 are then, in turn, removed, to thus free the finished trough.

Having thus described the invention, what I claim is:

1. A brace for a concrete mold comprising complemental sections having the ends of adjacent sections hollow, a centering member having end portions detachably fitted within the hollow ends of the brace sections and extended across the gap formed therebetween, a lever pivoted to the centering member between the ends thereof, and a member pivoted at one end to the said lever and having its other end adapted to adjustably engage one of the brace sections.

:2. A brace for a concrete mold comprising complemental sections having the ends of adjacent sections hollow, and having a plurality of external notches in the length of a hollowsection, a centering member havwith the notches of the other brace section.

3. A concrete trough form including a cylindrical outer shell, a cylindrical inner shell positioned concentrically within the outer shell, asplit annular brace fitting in the inner shell, a collar fixed to one end of the brace, a centering rod carried by said collar and slidably received in the opposite end of the brace, and a lever pivoted upon said rod and provided with a pawl to coact with the latter end of the brace whereby the lever may be swung for spreading the ends of the brace apart and expanding the brace to rigidly coact with the inner shell.

In testimony whereof I afiix my signature.

GEORGE E. HEILIGMAN. [n 5. 

